I am working here illegally and I have been here 2 years but I marry to an American and want to adjust my status. What's the step to take?

You you and your spouse need to start the adjustment of status process. Your husband needs to file an immigrant visa petition on your behalf. You will concurrently file an application seeking adjustment of status to lawful permanent resident. You and your spouse can find the required forms at www.uscis.gov.